OF EPPING FOREST. I45 



about May 20th. I also found some fresh specimens on May 25th, 

 but this species was not plentiful. I have met with it at Lynton, 

 Devonshire. 



(6). — Sexual generation. VI. Neuroteus aprilinus (Gir.) 



Gall. 



Appears from the bud. Smooth and often polythalamous. 



Colour : Greenish yellow. Shape : Circular to pear-shaped, 

 the apex being usually narrower than the base which is 

 embedded in the bud scales. Larval cavit}'' large, walls 

 very thin. 



Imago. 



I have, unfortunately, been unable to breed flies from these 

 galls, as in all the specimens which I found the perfect insects 

 had already emerged. 



The galls appear in April, and the insects towards the end 

 of the month or the beginning of May. They may be situated 

 in either the terminal or auxiliary buds, and yield up the perfect 

 insect very soon after they make their appearance from the 

 buds. With regard to the agamic generation of this species 

 some uncertainty seems still to exist. Beyerinch gives A. 

 solitavius as the agamic form, but this is probably a mistake. 

 Von Schlechtendal and Dr. Loew give Neuroterus schlechtendali 

 (Mayr), and Cameron also inclines to this view, but at the same 

 time, in his description of the perfect insect, he describes it as 

 sexual. Dr. Adler mentions Neuroterus ostreus as the probable 

 agamic form, and Professor Mayr seems to have since verified 

 this, but the insect belongs to the genus Andrims, and not to 

 the genus Neuroterus. 



OCCURRENCE IN EPPING FOREST. 



I found a fair number of specimens of this gall, though it was 

 not plentiful. The first appearance I noted was on May loth, 

 at which time the perfect insect had already emerged. 



These galls become brown with age. 



Ge?tus DRYOPHANTA {Foerster), 

 The agamic forms of this genus are usually easily separated, 

 but the sexual forms present very similar characters, and it is 

 impossible to differentiate between the species. The two genera- 

 tions. Agamic and Sexual, are readily distinguished. The former 

 have the legs covered with stiff hairs, which are absent in the 



K 



